Drill



Patented July 17, 1923.

FRANK W. ZIMMERMAN, OF AIDIIIAIRIILIIO,` TEXAS.

DRILL.

Application tiled September 7, 1921.

To (llllwhom z't lmay concern: A

Be it known that I, FRANK lV. ZIMMER- MAN, a citizen of the United States, residing at Amarillo, in the county of lotter and State of Texas, have invented a new and useful Drill, of which the following is a specification. Y v

This invention relates to earth boring drills, and it is the primary object of the invention to provide a combined drill and reamer, whereby the drillin and reaming results may be acdomplished y a single operation.

A further object ofthe invention is to provide a' drill of this character having an integral reamer forming a part thereof, the reamer having a spiral shoulder forming the cutting edge.

l/Vith the foregoing and other objects in View which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in th precise embodiment of the invention herein disclosed, may be made within the scope of what is claimed, without departing from `the spiritv of the invention- Referring to the drawing Figure l is a front elevational View of a drill constructed in accordance with the present invention.

Figure 2 is a side elevational view thereof` Figure 3 is a rear elevational view of the drill.

Figure 4 is a sectional View taken on line 4-4 of Figure 2.

Referring to the drawing in detail, the reference character 5 designates the body portion of the drill which has its upper tremity threaded as at G to provide means for permitting the drill proper to be positioned within the usual drill bar or stem now in use, in well drilling.

The drill body is preferably Hat and is provided with the grooves 7 and 8 formed in opposite sides thereof, which grooves ex- Serial No. 499,121.

tend throughout the length of the drill, terminating at a point adjacentthe cutting end thereof to provide channel-wa s for permitting the material dislodged y the cutting end of the drill to pass upwardlyv from the opening bored in the ground surface.

The reamer 9 forming an important feature of the present invention, comprises an integral body portion formed on the drill adjacent to the upper end thereof, the same being shown as extendin laterally from one of the edges of the dril This reamer 9 is provided with a spiral shoulder l0 formed at the base thereof, the shoulder constituting the cutting edge of a reamer and is designed to feed the ramer through its work.

AS stated, the reamer extends laterally of the drill body at one side thereof, so that when the drill is forced into the ground surface an opening will be formed, the opening having a diameter greater than the diameter of the drill body.

l? rom the foregoing it will be obvious that as 'the drill is bein forced through the ground surface, the we tubing may be applied over the drill, the reamer 9 forming an opening large enough to receive the well tubing which provides the well casing.

Having thus claimed the invention what is claimed as new is In a drill, a body portion formed with grooves in the opposed side faces thereof, a reamer formed integral with the body and disposed adjacent toone end thereof, the reamer being formed eccentrically with respect to the body portion, the cutting edge of the reamer being spirally formed and mergingwith the walls of one of the grooves of the body.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature in the presence of two witnesses.

FRANK W. ZMMERMAN. lVit-nesses:

W. T. DYKEMAN, 

